Force-pump.



H. FREHRS.

FORCE'PUMP. APPLICATION man AUGJHIBH.

Patented Mar. 5, 1918.

mama names, or m'imzcx, GERMAN Fence-PUMP.

. Application filed August 17, 1917. Serial No. 186,737.

To all whom it may concern:

Be it known that I, HERMANN 'FREHRS, subject of the German Emperor,-residing at 18 Lindenstrasse,Liibeck, Germany, have invented certain new and useful Improvements in Force-Pumps, of which thefollowing is a specification, reference being had therein to the accompanying drawing.

Pumps have heretofore been devised for forcing otf desired quantities of thick fluid masses by means of a piston by which they are sucked in and pushed out; A turnable hollow valve is employed and the piston does not reach to the entry and egress points of the masses, but there exists between the mass and the piston an air vacuum, which is injurious to the working of the pump. The present invention is designed as an improvement in this class of devices and embodies under the cylinder and the suckingotf-channel a compulsory running moving valve which at certain intervals connects the supply reservoir with the cylinder at such 7 point where'the piston changes its stroke and goes over on the sucking movement.

The invention is clearly illustrated in the accompanying drawing, which, with the letters of reference marked thereon, form a part of this specification, and in which- Figure l is a back view with parts in section.

Fig. 2 is a side view with away and portions in section.

Fig. 3 is a side view with the parts in a different position.

Fig. 4 is a side view of the driving chain wheel removed.

Like letters of reference indicate like parts throughout the different views.

Referringto the drawings,

a is a casing provided with a flange b by which it is tightly'connected with a supply reservoir and carries the cylinder 0, in which latter is a piston (Z, of which cl is the stem. This stem is connected with the slide e which, in turn, is connected with the sliding piece 6' by an adjustable pitman f which is parts broken rendered adjustable by a turn buckle or the like 8. g is a chain wheel rotatably mounted on the casing a and connected by chain 0 is a chain wheel 1" carried by the roller 12.

h is a valve so mounted that inthe closing position communication ismade between the sucking-ofi-channel and the cylinder. This valve i mounted on the casing aandis held by a handle is controlled by a spring Z and carrying a plug 7%, m being a curved-member formed'as a partial circular bow and, car

ried by the chain wheel. I

n represents. a channel communicating with the cylinder 0. 1

D STAT S AT NT F CE"- In operation, the roller ';0 "and the chain. i

wheel 9 are operatedthrough the medium ofthe chain o-and through the medium ofthe pitman the slide 6 is moved and simul- '65 taneously therewiththefpiston dismoVed i in the cylinder 0. In the lower position of I the piston, the curve at slides oil' the plug is and the slide valve is moved, so that by the ;movement of the valve h, a connection between the channel nand the cylinder 0 is provided. The mass under pressure to be pumped now passes from the supply reservoir through the channel 1?. to the cylinders at the moment the piston changes from its pushing stroke into its sucking movement,

so that the mass is only sucked into the cylinder c by the piston (l. WVhen the piston has reached its uppermost stroke, the curve m runs with its point against the plug is of the handle is and swings the same so that the valve h of the lower opening of the cylinder 0 is moved away from the lower opening of' the cylinder 0. During this movement the piston d remains stationary.

In order to permit this, the pitman f rests on the sliding piece e without actuating the slide'e, but after the crossing of the dead point the sliding piece e first'slides in the" slide e,'the slide itself and the piston then remaining still, but in the meantime until the catching of the sliding piece 6 on the slide e the valve hf reaches its openposition for.

the cylinder c and closes communication-between the cylinder 0 and thesupply reservoir. So long as the curve 'm under the plug is continues, that is, so long as the piston moves on its downward stroke and thereby carries the mass out of the cylinder 0, the open position of the valve is retained as the valve with the plug is supported on the curve. As soon as the end of the curve m passes the plug is, the support of'the handle is islifted and by the action of the spring I is moved back into the positionsoi that connection is afforded between the supply reservoir and the cylinder. ,Also during this backward movement of thevalve the piston (Z remains stationary.

The quantity pumped may be regulated by changing the length of the pitman f by thenut or'turn' buckle s. The Hut! ongthe 2 in WW When the CYHDdBIO'hRS IY-BBHi1lka Wi'bh or the mass, a vessel of any kind can be placed L thereunder and after it has been filled it"can be ezrsilv replaced bv another. r

that said cylinders can he fed out of one supply reservoir.

Mqdifiee ien max be resorted; to. and still e; w th the s op f; the intention soloing" asthe mass is discharged lnto', the; cylinder 7 With ut air space between the. pistonand the mass e What, is claime asinen 185* Aaiv orc p m pemp smg, m matmn,

me t re er irt ylinde 11 Pi "a 0 1:; otitliis patent. maybe; untamed for. five cents each, by, addresging the cpml ntsitgner cil tente a iralve Inovahle in the arc ofa circle so that inone direction of its movement connection is in'zt'cle'between"the' reservoir and cylinder and the opposite direction"thereservioir 4 is closed and the end of the cylinder tre'elyf 7 open and 'means' actuating said valve and The device can'he readily arranged so pieton whereby said piston is advanced/m1 the end of the cylinder when the reservoir'is closed and the "end of the cylinder freely open. e I

inthe pr s ncei two itnesses. V

'WitIlGSI-ES: V r Y \W J- Glienrnn V EEANQISQQ n e t eny wh e "i1 1 

